Freboldite Mineral Data

Freboldite Mineral Data +

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General Freboldite Information

Chemical Formula:

CoSe

Composition:

Molecular Weight = 137.89 gm

Cobalt 42.74 % Co

Selenium 57.26 % Se

______

100.00 %

Empirical Formula:

CoSe

Environment:

In dolomite veinlets.

IMA Status:

Valid Species (Pre-IMA) 1957

Locality:

From the Trogtal quarry, Steinbruch, and at Rote Berg, St. Andreasberg, Harz. Link to MinDat.org Location Data.

Name Origin:

For Professor Georg Frebold of Hannover, Germany.

Synonym:

ICSD 42541

PDF 15-464

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Freboldite Crystallography

Axial Ratios:

a:c = 1:1.4626

Cell Dimensions:

a = 3.61, c = 5.28, Z = 2; V = 59.59 Den(Calc)= 7.68

Crystal System:

Hexagonal - Dihexagonal DipyramidalH-M Symbol (6/m 2/m 2/m) Space Group: P 6₃/mmc

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 1.066(1), 2.05(1), 9.63(1),

Crystal Structure:

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Wyckoff R W G , Crystal Structures , 1 (1963) p.85-237, Second edition. Interscience Publishers, New York, New York, Note: ideal nickel arsenide structure

Physical Properties of Freboldite

Cleavage:

None

Color:

Copper red, Pink.

Diaphaniety:

Opaque

Hardness:

2.5-3 - Finger Nail-Calcite

Luster:

Metallic

Optical Properties of Freboldite

RL Anisotrophism:

Less than nickeline.

RL Color:

Similar to nickeline, but more intense violet in oil.

Calculated Properties of Freboldite

Electron Density:

r_electron=6.79 gm/cc
note: r_Freboldite=7.68 gm/cc.

Fermion Index

Fermion Index = 0.04351
Boson Index = 0.95649

Photoelectric:

PE_Freboldite= 61.17 barns/electron
U=PE_Freboldite x r_electron= 415.66 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Freboldite is Not Radioactive

Freboldite Classification

Dana Class:

2.8.11.10 (2)Sulfides - Including Selenides and Tellurides

(2.8)where Am Bn Xp, with (m+n):p=1:1

(2.8.11)Nickeline Group (Hexagonal: P63/mmc)

2.8.11.1 Nickeline NiAs P 6₃/mmc 6/m 2/m 2/m

2.8.11.2 Breithauptite NiSb P 6₃/mmc 6/m 2/m 2/m

2.8.11.3 Sederholmite NiSe P 6₃/mmc 6/m 2/m 2/m

2.8.11.4 Hexatestibiopanickelite (Ni,Pd)(Te,Sb) P 6₃/mmc 6/m 2/m 2/m

2.8.11.5 Sudburyite (Pd,Ni)Sb P 6₃/mmc 6/m 2/m 2/m

2.8.11.6 Kotulskite Pd(Te,Bi) P 6₃/mmc 6/m 2/m 2/m

2.8.11.7 Sobolevskite PdBi P 6₃/mmc 6/m 2/m 2/m

2.8.11.8 Stumpflite Pt(Sb,Bi) P 6₃/mmc 6/m 2/m 2/m

2.8.11.9 Langisite (Co,Ni)As P 6₃/mmc 6/m 2/m 2/m

2.8.11.10 Freboldite CoSe P 6₃/mmc 6/m 2/m 2/m

2.8.11.11 Sorosite! Cu(Sn,Sb) P 6₃/mmc 6/m 2/m 2/m

Strunz Class:

II/C.20-40 II - Sulfides and sulphosalts

II/C - Sulfides with metal: sulfur, selenium and tellurium = 1:1

II/C.20 - Nickeline group and related compounds, Polarite - Cherepanovite series

II/C.20-05 Sorosite! Cu(Sn,Sb) P 6₃/mmc 6/m 2/m 2/m

II/C.20-10 Langisite (Co,Ni)As P 6₃/mmc 6/m 2/m 2/m

II/C.20-20 Nickeline NiAs P 6₃/mmc 6/m 2/m 2/m

II/C.20-30 Breithauptite NiSb P 6₃/mmc 6/m 2/m 2/m

II/C.20-40 Freboldite CoSe P 6₃/mmc 6/m 2/m 2/m

II/C.20-50 Sederholmite NiSe P 6₃/mmc 6/m 2/m 2/m

II/C.20-70 Hexatestibiopanickelite (Ni,Pd)(Te,Sb) P 6₃/mmc 6/m 2/m 2/m

II/C.20-75 Yuanjiangite AuSn P 6₃/mmc 6/m 2/m 2/m

II/C.20-80 Kotulskite Pd(Te,Bi) P 6₃/mmc 6/m 2/m 2/m

II/C.20-90 Sudburyite (Pd,Ni)Sb P 6₃/mmc 6/m 2/m 2/m

II/C.20-95 Stumpflite Pt(Sb,Bi) P 6₃/mmc 6/m 2/m 2/m

II/C.20-100 Polarite Pd(Bi,Pb) Ccm21 mm2

II/C.20-110 Sobolevskite PdBi P 6₃/mmc 6/m 2/m 2/m

II/C.20-120 Ruthenarsenite (Ru,Ni)As P nma 2/m 2/m 2/m

II/C.20-130 Cherepanovite RhAs P nma 2/m 2/m 2/m

Other Freboldite Information

References:

NAME( AntBidBlaNic1) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)

See Also:

Links to other databases for Freboldite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - WWW-MINCRYST 13 -École des Mines de Paris

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Freboldite

CoSe
Dana No: 2.8.11.10 Strunz No: II/C.20-40
Locality:

Notes: